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date Mon, 13 Aug 2007 08:47:15 +0200
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5:49b78a777eb4 6:27bc7f280385
1 ;;; emu.el --- Emulation module for each Emacs variants
2
3 ;; Copyright (C) 1995,1996 Free Software Foundation, Inc.
4
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Version: $Id: emu.el,v 1.1.1.1 1996/12/18 04:06:19 steve Exp $
7 ;; Keywords: emulation, compatibility, NEmacs, MULE, Emacs/mule, XEmacs
8
9 ;; This file is part of emu.
10
11 ;; This program is free software; you can redistribute it and/or
12 ;; modify it under the terms of the GNU General Public License as
13 ;; published by the Free Software Foundation; either version 2, or (at
14 ;; your option) any later version.
15
16 ;; This program is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
20
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
25
26 ;;; Code:
27
28 (defmacro defun-maybe (name &rest everything-else)
29 (or (and (fboundp name)
30 (not (get name 'defun-maybe))
31 )
32 (` (or (fboundp (quote (, name)))
33 (progn
34 (defun (, name) (,@ everything-else))
35 (put (quote (, name)) 'defun-maybe t)
36 ))
37 )))
38
39 (put 'defun-maybe 'lisp-indent-function 'defun)
40
41
42 (or (boundp 'emacs-major-version)
43 (defconst emacs-major-version (string-to-int emacs-version)))
44 (or (boundp 'emacs-minor-version)
45 (defconst emacs-minor-version
46 (string-to-int
47 (substring
48 emacs-version
49 (string-match (format "%d\\." emacs-major-version) emacs-version)
50 ))))
51
52 (defvar running-emacs-18 (<= emacs-major-version 18))
53 (defvar running-xemacs (string-match "XEmacs" emacs-version))
54
55 (defvar running-mule-merged-emacs (and (not (boundp 'MULE))
56 (not running-xemacs) (featurep 'mule)))
57 (defvar running-xemacs-with-mule (and running-xemacs (featurep 'mule)))
58
59 (defvar running-emacs-19 (and (not running-xemacs) (= emacs-major-version 19)))
60 (defvar running-emacs-19_29-or-later
61 (or (and running-emacs-19 (>= emacs-minor-version 29))
62 (and (not running-xemacs)(>= emacs-major-version 20))))
63
64 (defvar running-xemacs-19 (and running-xemacs
65 (= emacs-major-version 19)))
66 (defvar running-xemacs-20-or-later (and running-xemacs
67 (>= emacs-major-version 20)))
68 (defvar running-xemacs-19_14-or-later
69 (or (and running-xemacs-19 (>= emacs-minor-version 14))
70 running-xemacs-20-or-later))
71
72 (cond (running-mule-merged-emacs
73 ;; for mule merged EMACS
74 (require 'emu-e20)
75 )
76 (running-xemacs-with-mule
77 ;; for XEmacs/mule
78 (require 'emu-x20)
79 )
80 ((boundp 'MULE)
81 ;; for MULE 1.* and 2.*
82 (require 'emu-mule)
83 )
84 ((boundp 'NEMACS)
85 ;; for NEmacs and NEpoch
86 (require 'emu-nemacs)
87 )
88 (t
89 ;; for EMACS 19 and XEmacs 19 (without mule)
90 (require 'emu-e19)
91 ))
92
93
94 ;;; @ binary access
95 ;;;
96
97 (defun insert-binary-file-contents-literally
98 (filename &optional visit beg end replace)
99 "Like `insert-file-contents-literally', q.v., but don't code conversion.
100 A buffer may be modified in several ways after reading into the buffer due
101 to advanced Emacs features, such as file-name-handlers, format decoding,
102 find-file-hooks, etc.
103 This function ensures that none of these modifications will take place.
104 \[emu.el]"
105 (as-binary-input-file
106 (insert-file-contents-literally filename visit beg end replace)
107 ))
108
109
110 ;;; @ MIME charset
111 ;;;
112
113 (defun charsets-to-mime-charset (charsets)
114 "Return MIME charset from list of charset CHARSETS.
115 This function refers variable `charsets-mime-charset-alist'
116 and `default-mime-charset'. [emu.el]"
117 (if charsets
118 (or (catch 'tag
119 (let ((rest charsets-mime-charset-alist)
120 cell csl)
121 (while (setq cell (car rest))
122 (if (catch 'not-subset
123 (let ((set1 charsets)
124 (set2 (car cell))
125 obj)
126 (while set1
127 (setq obj (car set1))
128 (or (memq obj set2)
129 (throw 'not-subset nil)
130 )
131 (setq set1 (cdr set1))
132 )
133 t))
134 (throw 'tag (cdr cell))
135 )
136 (setq rest (cdr rest))
137 )))
138 default-mime-charset)))
139
140
141 ;;; @ EMACS 19.29 emulation
142 ;;;
143
144 (defvar path-separator ":"
145 "Character used to separate concatenated paths.")
146
147 (defun-maybe buffer-substring-no-properties (beg end)
148 "Return the text from BEG to END, without text properties, as a string.
149 \[emu.el; EMACS 19.29 emulating function]"
150 (let ((string (buffer-substring beg end)))
151 (tl:set-text-properties 0 (length string) nil string)
152 string))
153
154 (defun-maybe match-string (num &optional string)
155 "Return string of text matched by last search.
156 NUM specifies which parenthesized expression in the last regexp.
157 Value is nil if NUMth pair didn't match, or there were less than NUM pairs.
158 Zero means the entire text matched by the whole regexp or whole string.
159 STRING should be given if the last search was by `string-match' on STRING.
160 \[emu.el; EMACS 19.29 emulating function]"
161 (if (match-beginning num)
162 (if string
163 (substring string (match-beginning num) (match-end num))
164 (buffer-substring (match-beginning num) (match-end num)))))
165
166 (or running-emacs-19_29-or-later
167 running-xemacs
168 ;; for Emacs 19.28 or earlier
169 (fboundp 'si:read-string)
170 (progn
171 (fset 'si:read-string (symbol-function 'read-string))
172
173 (defun read-string (prompt &optional initial-input history)
174 "Read a string from the minibuffer, prompting with string PROMPT.
175 If non-nil, second arg INITIAL-INPUT is a string to insert before reading.
176 The third arg HISTORY, is dummy for compatibility. [emu.el]
177 See `read-from-minibuffer' for details of HISTORY argument."
178 (si:read-string prompt initial-input)
179 )
180 ))
181
182 ;; This function was imported Emacs 19.30.
183 (defun-maybe add-to-list (list-var element)
184 "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
185 If you want to use `add-to-list' on a variable that is not defined
186 until a certain package is loaded, you should put the call to `add-to-list'
187 into a hook function that will be run only after loading the package.
188 \[emu.el; EMACS 19.30 emulating function]"
189 (or (member element (symbol-value list-var))
190 (set list-var (cons element (symbol-value list-var)))
191 ))
192
193
194 ;;; @ EMACS 19.30 emulation
195 ;;;
196
197 (cond ((fboundp 'insert-file-contents-literally)
198 )
199 ((boundp 'file-name-handler-alist)
200 (defun insert-file-contents-literally
201 (filename &optional visit beg end replace)
202 "Like `insert-file-contents', q.v., but only reads in the file.
203 A buffer may be modified in several ways after reading into the buffer due
204 to advanced Emacs features, such as file-name-handlers, format decoding,
205 find-file-hooks, etc.
206 This function ensures that none of these modifications will take place.
207 \[emu.el; Emacs 19.30 emulating function]"
208 (let (file-name-handler-alist)
209 (insert-file-contents filename visit beg end replace)
210 ))
211 )
212 (t
213 (defalias 'insert-file-contents-literally 'insert-file-contents)
214 ))
215
216
217 ;;; @ EMACS 19.31 emulation
218 ;;;
219
220 (defun-maybe buffer-live-p (object)
221 "Return non-nil if OBJECT is a buffer which has not been killed.
222 Value is nil if OBJECT is not a buffer or if it has been killed.
223 \[emu.el; EMACS 19.31 emulating function]"
224 (and object
225 (get-buffer object)
226 (buffer-name (get-buffer object))
227 ))
228
229 (or (fboundp 'save-selected-window)
230 ;; This function was imported Emacs 19.33.
231 (defmacro save-selected-window (&rest body)
232 "Execute BODY, then select the window that was selected before BODY.
233 \[emu.el; EMACS 19.31 emulating function]"
234 (list 'let
235 '((save-selected-window-window (selected-window)))
236 (list 'unwind-protect
237 (cons 'progn body)
238 (list 'select-window 'save-selected-window-window))))
239 )
240
241
242 ;;; @ XEmacs emulation
243 ;;;
244
245 (defun-maybe functionp (obj)
246 "Returns t if OBJ is a function, nil otherwise.
247 \[emu.el; XEmacs emulating function]"
248 (or (subrp obj)
249 (byte-code-function-p obj)
250 (and (symbolp obj)(fboundp obj))
251 (and (consp obj)(eq (car obj) 'lambda))
252 ))
253
254
255 ;;; @ for XEmacs 20
256 ;;;
257
258 (or (fboundp 'char-int)
259 (fset 'char-int (symbol-function 'identity))
260 )
261 (or (fboundp 'int-char)
262 (fset 'int-char (symbol-function 'identity))
263 )
264
265
266 ;;; @ for text/richtext and text/enriched
267 ;;;
268
269 (cond ((or running-emacs-19_29-or-later running-xemacs-19_14-or-later)
270 ;; have enriched.el
271 (autoload 'richtext-decode "richtext")
272 (or (assq 'text/richtext format-alist)
273 (setq format-alist
274 (cons
275 (cons 'text/richtext
276 '("Extended MIME text/richtext format."
277 "Content-[Tt]ype:[ \t]*text/richtext"
278 richtext-decode richtext-encode t enriched-mode))
279 format-alist)))
280 )
281 (t
282 ;; don't have enriched.el
283 (autoload 'richtext-decode "tinyrich")
284 (autoload 'enriched-decode "tinyrich")
285 ))
286
287
288 ;;; @ end
289 ;;;
290
291 (provide 'emu)
292
293 ;;; emu.el ends here